Long Ago a Russian/Soviet Scientist claimed that Phobos was a artificial — a place where the Martians fled when the surface became un-inhabitable. It does look sorta like a contrivance of some sort. Much damaged by space rocks. Could it be hollow?
Richard C. Hoaxland would say yes, but I wonder why they would build a hollow moon rather than tunneling into the Martian interior? I think they came here and became Democrats, and now they’re blowing it on Earth as well.